DK200300327A - Process for manufacturing shell structures, e.g. wind turbine blades made of fiber-reinforced plastic - Google Patents

Description

PATENT REQUIREMENTS 1. Process for manufacturing shell structures, e.g. wind turbine blades, of fiber-reinforced plastic, e.g. fiberglass-reinforced polyester, the shell structure comprising two half shells (4) molded by laying and impregnating fiber mats in each mold half, and then, after curing, bonded along their edges while in their mold halves (2) one or both half-shells (4) are applied to glue before the edges of the half-shells (4) are then pressed against each other, characterized in that before the bonding the half-shells (4) are each provided with a plurality of straps (8) which are internally a half-shell end extends beyond the edge of the half-shell and outwards on the outside of the mold half (2; 16, 18) and by means of clamping means (10) arranged on the outer side (5) of the mold half (2; 16, 18). the straps (8) a feature such that the shell halves along their edge abut the inside of the mold half, which feature in the straps (8) is maintained until the glue between the edges of the compressed half shells (4) is annealed. Method according to claim 1, characterized in that the straps (8) are arranged at predetermined intervals along the edges of the half shells so that the straps of the two half shells do not coincide when the half shells are glued together. Method according to claim 1 or 2, characterized in that the straps (8) are fastened, especially by gluing, to the inside of the half-shells after casting them. Method according to claim 1 or 2, characterized in that the straps (8) are placed in connection with the fiber laying, especially between layers thereof, and are laminated in the half shells during the casting thereof. Method according to one or more of the preceding claims, characterized in that the straps (8) are made of a fiber-based material, in particular a woven material and preferably a fiber web of the same type as a mat included in the fiber laying. Method according to claim 5, characterized in that the strap (8) between its inner and outer ends (12) is provided with an airtight region (22) which is preferably provided by molding a plastic material, e.g. polyester or polyurethane. Method according to one or more of Claims 1 to 4, characterized in that the straps are entirely made of a flexible airtight material, especially a plastic material, e.g. polyurethane or polyamide. Method according to one or more of the preceding claims, characterized in that the straps are applied to the traps before the edge area of the half shell in question has withdrawn from the inner half of the mold half due to the shrinkage during the half shell hardening. Method according to one or more of claims 1 to 7, characterized in that the half shell in question is allowed to cure, so that its edge region extends away from the inside of the mold half concerned, after which the straps are applied to pull the edge shell regions into contact with the mold. inside, before gluing the two half shells.